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Hwangbo Y, Kim WJ, Chu MK, Yun CH, Yang KI.Hwangbo Y, et al. Among authors: chu mk.Sleep Med. 2013 Jun;14(6):549-54. doi: 10.1016/j.sleep.2013.02.009. Epub 2013 May 3.Sleep Med. 2013.PMID: 23643647
Chu MK, Kim DW, Kim BK, Kim JM, Jang TW, Park JW, Lee KS, Cho SJ.Chu MK, et al.J Headache Pain. 2013 Oct 4;14(1):82. doi: 10.1186/1129-2377-14-82.J Headache Pain. 2013.PMID: 24093215Free PMC article.